diff ( y , x , 3 ) = sin(x); ! Digits := 32; max_terms := 30; ! x_start := 0.1; x_end := 1.5 ; # # trouble about Pi/2 # diff(y,0,exact_soln_y(x_start)); diff(y,1,exact_soln_yp(x_start)); diff(y,2,exact_soln_ypp(x_start)); glob_look_poles := true; glob_max_iter := 20; ! exact_soln_y := proc(x) return(1.0 + cos(x)); end; exact_soln_yp := proc(x) return(-sin(x)); end; exact_soln_ypp := proc(x) return(-cos(x)); end;